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Related Experiment Video

Updated: Jun 28, 2026

Quantification of Metal Leaching in Immobilized Metal Affinity Chromatography

Quantification of Metal Leaching in Immobilized Metal Affinity Chromatography

Published on: January 17, 2020

Sulphonated azo-dyes as extractive metallochromic reagents.

C Woodward¹, H Freiser

¹Department of Chemistry University of Arizona Tucson, Arizona 85721, U.S.A.

|April 1, 1973

Summary

Researchers explored ion-pair complexes using metallochromic indicators and quaternary ammonium ions. This study identifies useful reagents for analytical chemistry applications, focusing on azo dyes and oxines.

Area of Science:

Analytical Chemistry
Coordination Chemistry

Background:

Metallochromic indicators are crucial for metal ion detection.
Ion-pair complexation offers a method for extracting and quantifying metal ions.

Purpose of the Study:

To survey analytically useful extractable ion-pair complexes.
To evaluate the efficacy of metallochromic indicator-metal complexes with quaternary ammonium ions.

Main Methods:

Formation of ion-pair complexes using o,o'-dihydroxyazo dyes and azo-oxines.
Complexation with various metal ions and quaternary ammonium ions.
Extraction and analysis of the formed complexes.

Main Results:

Identified specific metallochromic indicator-metal complexes forming extractable ion-pair complexes.

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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions

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Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes

Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes

Published on: April 1, 2013

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Last Updated: Jun 28, 2026

Quantification of Metal Leaching in Immobilized Metal Affinity Chromatography

Quantification of Metal Leaching in Immobilized Metal Affinity Chromatography

Published on: January 17, 2020

Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions

Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions

Published on: July 17, 2020

Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes

Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes

Published on: April 1, 2013

Demonstrated the utility of o,o'-dihydroxyazo dyes and azo-oxines as ligands.

Showcased the role of quaternary ammonium ions in facilitating complex extraction.

Conclusions:

The surveyed ion-pair complexes are analytically useful for metal ion determination.
o,o'-dihydroxyazo dyes and azo-oxines are effective reagents in this complexation strategy.
Quaternary ammonium ions enhance the extractability of these metallochromic indicator-metal complexes.